Signed-off-by: Wolfgang Bumiller <w.bumil...@proxmox.com>
---
src/PVE/LXC/Tools.pm | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/src/PVE/LXC/Tools.pm b/src/PVE/LXC/Tools.pm
index bebd7d8..ce37cee 100644
--- a/src/PVE/LXC/Tools.pm
+++ b/src/PVE/LXC/Tools.pm
@@ -2,6 +2,8 @@
package PVE::LXC::Tools;
+use Errno qw(ENOSYS);
+
use PVE::SafeSyslog;
# LXC introduced an `lxc.hook.version` property which allows hooks to be
executed in different
@@ -130,4 +132,20 @@ sub cgroup_do_write($$) {
return 1;
}
+# Check whether the kernel supports the new mount api. This is used in the
pre-start hook and in
+# the hotplugging code.
+my $cached_can_use_new_mount_api = undef;
+sub can_use_new_mount_api() {
+ if (!defined($cached_can_use_new_mount_api)) {
+ if (PVE::Tools::move_mount(-1, 0, -1, 0, 0)) {
+ # This should not be possible...
+ die "kernel behaved unexpectedly: move_mount(-1, NULL, -1, NULL)
did not fail!\n";
+ }
+ # On older kernels the syscall doesn't exist and we get ENOSYS. (For
newer kernels this call
+ # will fail with EFAULT instead, since we pass in a NULL pointer as
file system name.)
+ $cached_can_use_new_mount_api = ($! != ENOSYS);
+ }
+ return $cached_can_use_new_mount_api;
+}
+
1;
--
2.20.1
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